Sen began his high-school education at St Gregory's School in Dhaka in 1940. From fall 1941, Sen studied at Visva-Bharati University school. He stood first in I.Sc.Examination. He later went to Presidency College, Kolkata, where he earned a B.A. in Economics with first class, with a minor in Mathematics, as a graduating student of the University of Calcutta. In 1953, he moved to Trinity College, Cambridge, where he earned a second B.A. in Economics in 1955 with a first class topping the list. He was elected President of the Cambridge Majlis. While Sen was officially a Ph.D. student at Cambridge (though he had finished his research in 1955-6), he was offered the position of Professor and Head of the Economics Department of the newly created Jadavpur University in Calcutta, and he became the youngest chairman to head the Department of Economics. He served in that position, starting the new Economics Department, during 1956 to 1958.

Meanwhile, Sen was elected to a Prize Fellowship at Trinity College, which gave him four years of freedom to do anything he liked; he made the radical decision to study philosophy. Sen explained: "The broadening of my studies into philosophy was important for me not just because some of my main areas of interest in economics relate quite closely to philosophical disciplines (for example, social choice theory makes intense use of mathematical logic and also draws on moral philosophy, and so does the study of inequality and deprivation), but also because I found philosophical studies very rewarding on their own".[5] His interest in philosophy, however, dates back to his college days at Presidency, where he read books on philosophy and debated philosophical themes.

In Cambridge, there were major debates between supporters of Keynesian economics on the one hand, and the "neo-classical" economists skeptical of Keynes, on the other. However, because of a lack of enthusiasm for social choice theory in both Trinity and Cambridge, Sen had to choose a different subject for his Ph.D. thesis, which was on "The Choice of Techniques" in 1959, though the work had been completed much earlier (except for some valuable advice from his adjunct supervisor in India, Professor A.K. Dasgupta, given to Sen while teaching and revising his work at Jadavpur) under the supervision of the "brilliant but vigorously intolerant" post-Keynesian, Joan Robinson.[6]Quentin Skinner notes that Sen was a member of the secret society Cambridge Apostles during his time at Cambridge.[7]

In 1981, Sen published Poverty and Famines: An Essay on Entitlement and Deprivation (1981), a book in which he argued that famine occurs not only from a lack of food, but from inequalities built into mechanisms for distributing food. Sen also argued that the Bengal famine was caused by an urban economic boom that raised food prices, thereby causing millions of rural workers to starve to death when their wages did not keep up.[9]

Sen's interest in famine stemmed from personal experience. As a nine-year-old boy, he witnessed the Bengal famine of 1943, in which three million people perished. This staggering loss of life was unnecessary, Sen later concluded. He presents data that there was an adequate food supply in Bengal at the time, but particular groups of people including rural landless labourers and urban service providers like haircutters did not have the means to buy food as its price rose rapidly due to factors that include British military acquisition, panic buying, hoarding, and price gouging, all connected to the war in the region. In Poverty and Famines, Sen revealed that in many cases of famine, food supplies were not significantly reduced. In Bengal, for example, food production, while down on the previous year, was higher than in previous non-famine years. Thus, Sen points to a number of social and economic factors, such as declining wages, unemployment, rising food prices, and poor food-distribution, which led to starvation. His capabilities approach focuses on positive freedom, a person's actual ability to be or do something, rather than on negative freedom approaches, which are common in economics and simply focuses on non-interference. In the Bengal famine, rural laborers' negative freedom to buy food was not affected. However, they still starved because they were not positively free to do anything, they did not have the functioning of nourishment, nor the capability to escape morbidity.

In addition to his important work on the causes of famines, Sen's work in the field of development economics has had considerable influence in the formulation of the "Human Development Report",[10] published by the United Nations Development Programme.[11] This annual publication that ranks countries on a variety of economic and social indicators owes much to the contributions by Sen among other social choice theorists in the area of economic measurement of poverty and inequality.

Sen's revolutionary contribution to development economics and social indicators is the concept of "capability" developed in his article "Equality of What".[12] He argues that governments should be measured against the concrete capabilities of their citizens. This is because top-down development will always trump human rights as long as the definition of terms remains in doubt (is a "right" something that must be provided or something that simply cannot be taken away?). For instance, in the United States citizens have a hypothetical "right" to vote. To Sen, this concept is fairly empty. In order for citizens to have a capacity to vote, they first must have "functionings". These "functionings" can range from the very broad, such as the availability of education, to the very specific, such as transportation to the polls. Only when such barriers are removed can the citizen truly be said to act out of personal choice. It is up to the individual society to make the list of minimum capabilities guaranteed by that society. For an example of the "capabilities approach" in practice, see Martha Nussbaum's Women and Human Development.[13]

He wrote a controversial article in The New York Review of Books entitled "More Than 100 Million Women Are Missing" (see Missing women of Asia), analyzing the mortality impact of unequal rights between the genders in the developing world, particularly Asia. Other studies, including one by Emily Oster, had argued that this is an overestimation, though Oster has since then recanted her conclusions.[14]

Welfare economics seeks to evaluate economic policies in terms of their effects on the well-being of the community. Sen, who devoted his career to such issues, was called the "conscience of his profession". His influential monograph Collective Choice and Social Welfare (1970), which addressed problems related to individual rights (including formulation of the liberal paradox), justice and equity, majority rule, and the availability of information about individual conditions, inspired researchers to turn their attention to issues of basic welfare. Sen devised methods of measuring poverty that yielded useful information for improving economic conditions for the poor. For instance, his theoretical work on inequality provided an explanation for why there are fewer women than men in India[15] and China despite the fact that in the West and in poor but medically unbiased countries, women have lower mortality rates at all ages, live longer, and make a slight majority of the population. Sen claimed that this skewed ratio results from the better health treatment and childhood opportunities afforded boys in those countries, as well as sex-selective abortions.

Governments and international organizations handling food crises were influenced by Sen's work. His views encouraged policy makers to pay attention not only to alleviating immediate suffering but also to finding ways to replace the lost income of the poor—for example through public works—and to maintain stable prices for food. A vigorous defender of political freedom, Sen believed that famines do not occur in functioning democracies because their leaders must be more responsive to the demands of the citizens. In order for economic growth to be achieved, he argued, social reforms—such as improvements in education and public health—must precede economic reform.

In 2009, Sen published a new book called The Idea of Justice.[1] Based on his previous work in welfare economics and social choice theory, but also on his philosophical thoughts, he presented his own theory of justice that he meant to be an alternative to the influential modern theories of justice of John Rawls or John Harsanyi. In opposition to Rawls but also earlier justice theoreticians Immanuel Kant, Jean-Jacques Rousseau or David Hume, and inspired by the philosophical works of Adam Smith and Mary Wollstonecraft, Sen developed a theory that is both comparative and realizations-oriented (instead of being transcendental and institutional). However, he still regards institutions and processes as being important. As an alternative to Rawls's veil of ignorance, Sen chose the thought experiment of an impartial spectator as the basis of his theory of justice. He also stressed the importance of public discussion (understanding democracy in the sense of John Stuart Mill) and a focus on people's capabilities (an approach that he had co-developed), including the notion of universal human rights, in evaluating various states with regard to justice.

In May 2007, he was appointed as chairman[18] of Nalanda Mentor Group to examine the framework of international cooperation, and proposed structure of partnership, which would govern the establishment of Nalanda International University Project as an international centre of education seeking to revive the ancient center of higher learning which was present in India from the 5th century to 1197.

On 19 July 2012, Sen was named the first chancellor of the proposed Nalanda University (NU).[19] Teaching began in August 2014. On 20 February 2015, Amartya Sen withdrew his candidature for a second term.

Amartya Sen was critical of IndianPrime MinisterNarendra Modi when he was announced as the prime ministerial candidate by the BJP. In April 2014, he said that Modi would not make a good Prime Minister.[30] But later in December 2014, he changed his views and said that Narendra Modi did give people a sense of faith that things can happen.[31] In February 2015, Sen opted out of seeking a second term for the chancellor post of Nalanda university stating that the Government of India was not keen on him continuing in the post.[32]

Sen has been married three times. His first wife was Nabaneeta Dev Sen, an Indian writer and scholar, by whom he had two daughters: Antara, a journalist and publisher, and Nandana, a Bollywood actress. Their marriage broke up shortly after they moved to London in 1971.[21] Later on, Sen married his second wife, Eva Colorni, who died from stomach cancer in 1985.[21] He has two children by Eva, a daughter Indrani, who is a journalist in New York, and a son Kabir, a hip hop artist, MC, and music teacher at Shady Hill School. In 1991, Sen married Emma Georgina Rothschild, who serves as the Jeremy and Jane Knowles Professor of History at Harvard University.

The Sens have a house in Cambridge, Massachusetts, which is the base from which they teach during the academic year. They also have a home in Cambridge, England, where Sen is a Fellow of Trinity College, Cambridge, and Rothschild is a Fellow of Magdalene College. He usually spends his winter holidays at his home in Santiniketan in West Bengal, India, where he used to go on long bike rides until recently. Asked how he relaxes, he replies: "I read a lot and like arguing with people."[21]

In some ways people had got used to the idea that India was spiritual and religion-oriented. That gave a leg up to the religious interpretation of India, despite the fact that Sanskrit had a larger atheistic literature than what exists in any other classical language. Madhava Acharya, the remarkable 14th century philosopher, wrote this rather great book called Sarvadarshansamgraha, which discussed all the religious schools of thought within the Hindu structure. The first chapter is on the philosophy of Lokayata – a very strong presentation of the argument in favor of atheism and materialism.

^United Nations Development Programme, UNDP, ed. (2010). "Overview | Celebrating 20 years of human development". Human Development Report 2010 | 20th anniversary edition | the real wealth of nations: pathways to human development. New York, NY: United Nations Development Programme. p. 2. ISBN9780230284456. ...the first HDR called for a different approach to economics and development - one that put people at the centre. The approach was anchored in a new vision of development, inspired by the creative passion and vision of Mahbub ul Haq, the lead author of the early HDRs, and the ground-breaking work of Amartya Sen.Pdf version.

^"Ministry of External Affairs, Press Release: Nalanda University Bill". Press Information Bureau, Government of India. 11 August 2010. Retrieved 4 January 2012. The University of Nalanda is proposed to be established under the aegis of the East Asia Summit (EAS), as a regional initiative. Government of India constituted a Nalanda Mentor Group (NMG) in 2007, under the Chairmanship of Prof. Amartya Sen...

^"Amartya Sen speaks on culture at World Bank". Tokyo: The World Bank | News & Broadcast. 13 December 2000. Retrieved 16 June 2014. When a Hindu priest begins the puja today, invoking an alternative calendar and declaring the year 1406, what is he remembering? Mohamed’s flight from Mecca to Medina, in a mixed lunar and solar form! ... This is why cultural studies are so important, because it brings out clearly how non-insular cultures are and their willingness to accept new influences.Pdf transcript.

^Chanda, Arup (28 December 1998). "Market economy not the panacea, says Sen". Rediff On The Net. Retrieved 16 June 2014. Although this is a personal matter... But the answer to your question is: No. I do not believe in god.